Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C21/00—Alloys based on aluminium
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
  • B22F3/12—Both compacting and sintering
  • B22F3/14—Both compacting and sintering simultaneously
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C1/00—Making non-ferrous alloys
  • C22C1/04—Making non-ferrous alloys by powder metallurgy
  • C22C1/0408—Light metal alloys
  • C22C1/0416—Aluminium-based alloys
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
  • C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
  • C22C32/0052—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides

Definitions

• the present invention is concerned with hot working of aluminum-base alloys and, more particularly, with hot working by forging, rolling and the like aluminum-base alloys having an ultra-fine hard dispersed transition-metal-intermetallic phase in the microstructure, this intermetallic dispersed phase being of such a character that it cannot be solubilized in the aluminum matrix below the melting point of the matrix.
• k is an empirical constant (whose value depends upon the characteristics of the matrix alloy), and f is the volume fraction of the hard phase. The above relationship has been shown to hold approximately true at room temperature for a variety of dual or multi-phase alloys, including Al-SiC composites.
• alloys prepared by mechanical alloying and containing 5-35 volume percent Al 3 Ti in an aluminum matrix along with dispersed Al 4 C 3 and Al 2 O 3 have tensile elongations in excess of 5% and are therefor amenable to hot working.
• This object also includes the hot worked alloy product.
• the present invention contemplates hot working by a process permitting metal flow in at least two directions, a mechanically alloyed aluminum-base alloy consisting essentially of an aluminum matrix containing optional solid solution hardeners, about 5 to about 35 volume percent of an aluminum transition metal intermetallic compound, carbide phases, principally aluminum carbide up to about 14 volume percent and optional oxidic phases, principally aluminum oxide up to about 5 volume percent, said hot working being conducted in the temperature interval between 370° C. and the solidus temperature of the aluminum matrix.
• the invention also contemplates the resultant hot worked alloy which exhibits a unique combination of strength, modulus, ductility and stability over a range of temperatures up to about 95% of the melting temperature (0.95 Tm).
• the aluminum-base alloys to be hot worked in accordance with the present invention are made by mechanical alloying following generally procedures as described in U.S. Pat. Nos. 3,740,210, 4,668,470 and 4,688,282 using stearic acid as a process control agent.
• the levels of carbide and oxide set forth in the preceding paragraph generally derive from the levels of process control agent normally used in mechanical alloying with or without intentional inclusion of oxide, e.g. alumina or yttria or carbon in a mechanically alloyed charge.
• oxide e.g. alumina or yttria or carbon
• up to about 5 volume percent carbide and 2 volume percent oxide are the usual amounts of these phases encountered when stearic acid is employed as the process control agent with no other non-metallic additions to the charge.
• compositions of hot worked aluminum-base alloys are set forth in Table 1.
• the alloys in Table 1 contain roughly 15 to 31 volume percent of aluminum transition metal intermetallic phase, specifically in alloys 1-3 and 11 the phase being Al 3 Ti in the range of 15 to 31 volume percent.
• the intermetallic phase is a combination made up principally of Al 3 Ti along with aluminides and/or other compounds of other transition metals.
• the "intermetallic phase” may be a single phase or more than one phase, no specific limitation being implied by the singularity of the term "intermetallic phase”.
• solid solution hardeners in an aluminum matrix includes not only normal elements such as silicon, copper, lithium, magnesium and zinc which, in conventional amounts, are soluble in a solid aluminum matrix but also those elements which, although forming insoluble products at low temperature, e.g. below 100° C. are soluble in the matrix at the temperature of hot working.
• carbide phases includes not only aluminum carbide but also titanium carbide, carbides of other alloy ingredients and chemical modifications of aluminum, titanium and other carbides.
• oxidic phase is intended to include not only aluminum oxide formed by reaction between aluminum and oxygen in the stearic acid process control agent during mechanical alloying but also small amounts, e.g. up to about 5 volume percent of other oxide, e.g. yttria, yttrium-aluminum-garnet or alumina which might be added to or formed while processing a mechanical alloying charge.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Manufacturing & Machinery (AREA)
• Powder Metallurgy (AREA)
• Manufacture Of Alloys Or Alloy Compounds (AREA)
• Metal Rolling (AREA)

Priority Applications (7)

Applications Claiming Priority (1)

Publications (1)

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Family Applications (1)

Country Status (7)

Cited By (5)

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Citations (10)

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• 1988
  • 1988-05-06 US US07/190,714 patent/US4832734A/en not_active Expired - Fee Related
• 1989
  • 1989-04-26 JP JP1107123A patent/JPH01316442A/ja active Pending
  • 1989-04-27 AU AU33792/89A patent/AU601939B2/en not_active Ceased
  • 1989-05-01 KR KR1019890005799A patent/KR920001612B1/ko not_active IP Right Cessation
  • 1989-05-04 BR BR898902090A patent/BR8902090A/pt unknown
  • 1989-05-05 EP EP89108154A patent/EP0340789B1/en not_active Expired - Lifetime
  • 1989-05-05 DE DE8989108154T patent/DE68905652T2/de not_active Expired - Fee Related

Patent Citations (10)

Non-Patent Citations (4)

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